This video from the USA says about itself:
Ruby-throated, Broad-tailed, Rivoli’s, and Anna’s Hummingbirds all passed through the West Texas hummingbird cam site in the Davis Mountains this Monday morning in under a minute! During these peak migration periods, up to 10 different species of hummingbirds can be spotted on cam.
Watch live at http://allaboutbirds.org/texashummers for more information about hummingbirds and highlights from the feeders.
As the video shows, the feeders attract bees as well.